Fig. 7.

Photosynthetic CO₂ assimilation rate, A (A), stomatal conductance, g_s (B), internal CO₂ concentration, Ci (C) and transpiration, T_r (D) measured from the youngest fully expanded leaves of I. batatas grown under different light conditions. Means with different letters are statistically different (P < 0.05; n = 6) as determined by LSD multiple comparison test. SL, Sunlight; SL + L-LED, SL with supplemental LED at a PPFD of 150 μmol m⁻² s⁻¹; SL + H-LED, SL with supplemental LED at a PPFD of 300 μmol m⁻² s⁻¹.